Question

Помогите решить задание.

Answer 1

Объяснение:

$sqrt{2 frac{7}{9} } - 5 sqrt{1.96} = \ = sqrt{ frac{25}{9} } - 5 times 1.4 = \ = frac{5}{3} - 7 = 1 frac{2}{3} - 7 = - 6 frac{2}{3}$

$sqrt{2.5} times sqrt{14 frac{2}{5} } = \ = sqrt{2.5 times 14.4} = \ = sqrt{0.25 times 144} = 0.5 times 12 = 6$

$sqrt{80} div 5 = sqrt{80 div 5} = sqrt{16} = 4$

${( - 2 sqrt{7} )}^{2} = {( - 2)}^{2} times ( sqrt{7}) {}^{2} = \ = 4 times 7 = 28$